CN106873337A - Image processing system and image forming method - Google Patents

Image processing system and image forming method Download PDF

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Publication number
CN106873337A
CN106873337A CN201610811604.3A CN201610811604A CN106873337A CN 106873337 A CN106873337 A CN 106873337A CN 201610811604 A CN201610811604 A CN 201610811604A CN 106873337 A CN106873337 A CN 106873337A
Authority
CN
China
Prior art keywords
image
transfer
face
toner
intermediate transfer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201610811604.3A
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Chinese (zh)
Inventor
安藤昌雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba TEC Corp
Original Assignee
Toshiba Corp
Toshiba TEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba TEC Corp filed Critical Toshiba Corp
Publication of CN106873337A publication Critical patent/CN106873337A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/24—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 whereby at least two steps are performed simultaneously
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/22—Processes involving a combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G13/24—Processes involving a combination of more than one step according to groups G03G13/02 - G03G13/20 whereby at least two steps are performed simultaneously
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G03G15/238—Arrangements for copying on both sides of a recording or image-receiving material using more than one reusable electrographic recording member, e.g. single pass duplex copiers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • G03G2215/0122—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt
    • G03G2215/0125—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted
    • G03G2215/0132—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted vertical medium transport path at the secondary transfer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • G03G2215/0122—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt
    • G03G2215/0135—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being vertical
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G03G2215/168—Simultaneous toner image transfer and fixing at the first transfer point
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G03G2215/168—Simultaneous toner image transfer and fixing at the first transfer point
    • G03G2215/1685—Simultaneous toner image transfer and fixing at the first transfer point using heat
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G03G2215/1695—Simultaneous toner image transfer and fixing at the second or higher order transfer point

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

The present invention provides image processing system and image forming method.The image processing system of implementation method includes：First image forming part, the second image forming part, the first intermediate transfer belt, the second intermediate transfer belt, delivery section and transfer-fixing device.First image forming part forms the first toner image using electronegative first toner.Second image forming part forms the second toner image using the second toner of positively charged.First intermediate transfer belt is formed by endless belt, from first the first toner image of image forming part primary transfer, by primary transfer after the first toner image move to first secondary transfer position.Second intermediate transfer belt is formed by the endless belt relative with the first intermediate transfer belt, from second the second toner image of image forming part primary transfer, by primary transfer after the second toner image move to second secondary transfer position.Second secondary transfer position is relative with first secondary transfer position.

Description

Image processing system and image forming method
Technical field
Present embodiment is related to image processing system and image forming method.
Background technology
Exist and a kind of toner is fixed in the image processing system on thin slice.Image processing system is sometimes in the double of thin slice Face carries out image formation (referred to as printed on both sides).In this case, image processing system is formed and is transferred to the positive of thin slice First toner image.Image processing system after the front that the first toner image is transferred into thin slice, by fuser First toner image is fixed in the front of thin slice.Thin slice is overturn after fixing by turning device.Hereafter, image is formed Device forms second toner image at the back side for being transferred to thin slice.Image processing system is received from the thin of turning device supply Piece.Image processing system after the back side that the second toner image is transferred into thin slice, by fuser by the second toner Image is fixed in the back side of thin slice.
Fuser has heating roller and backer roll.Be clipped in the middle for thin slice and toner image entered by heating roller and backer roll Row heating and pressurization.
In printed on both sides, image processing system carries out image twice to a thin slice and is formed and be fixed respectively.Therefore, phase Need to spend timing more than twice than being printed on one side.And, fuser also needs to pre- in the toner image of fixing one side Heating roller is first passed through to preheat backer roll.The energy consumption of fuser is twice for being printed on one side or so.
Printed on both sides has that printing timing increases and power consumption increase compared with being printed on one side.
The content of the invention
The image processing system of implementation method includes：First image forming part, the shape using electronegative first toner Into the first toner image；Second image forming part, the second toner image is formed using the second toner of positively charged；The One intermediate transfer belt, is formed by endless belt, from the first toner image described in described first image forming portion primary transfer, and will First toner image after primary transfer moves to first secondary transfer position；Second intermediate transfer belt, by with institute State the relative endless belt of the first intermediate transfer belt to be formed, from the second toner figure described in the second image forming part primary transfer Picture, and by primary transfer after second toner image move to relative second of secondary transfer position with described first Secondary transfer position；Delivery section, thin slice is transported to described first secondary transfer position and described second secondary transfer printing Between position；And transfer-fixing device, described first secondary transfer position by described on the first intermediate transfer band First toner image is secondarily transferred to the first face of the thin slice, and is transferred to first toner in first face Image is fixed in first face, also, described second secondary transfer position by the institute on the second intermediate transfer band State the second toner image and be secondarily transferred to second face with first face opposite side of the thin slice, and be transferred to institute Second toner image for stating the second face is fixed in second face.
The image forming method of implementation method includes：The first toner figure is formed using electronegative first toner Picture；The second toner image is formed using the second toner of positively charged；First toner image is transferred to First intermediate transfer belt, and by primary transfer after first toner image move to the of first intermediate transfer belt One secondary transfer position；Second toner image is transferred to the second intermediate transfer belt, and by after primary transfer Second toner image move to second intermediate transfer belt second secondary transfer position；Thin slice is transported to Between described first secondary transfer position and described second secondary transfer position；And described first secondary transfer printing position The first face that first toner image on the first intermediate transfer band is secondarily transferred to the thin slice is put, and will be turned First toner image for printing to first face is fixed in first face, also, in described second secondary transfer printing Position by second toner image on the second intermediate transfer band be secondarily transferred to the thin slice with described first Second face of face opposite side, and be transferred to second toner image in second face and be fixed in second face.
Brief description of the drawings
Fig. 1 is the schematic cross-section for being monolithically fabricated example of the image processing system for showing first embodiment.
Fig. 2 is the schematic cross-section of the configuration example of the transfer-fixing device of the image processing system for showing first embodiment.
Fig. 3 is the block diagram of the function configuration example of the image processing system for showing first embodiment.
Fig. 4 is that the section illustrated to the action of the transfer-fixing device of the image processing system of first embodiment is illustrated Figure.
Fig. 5 is the schematic cross-section for being monolithically fabricated example of the image processing system for showing second embodiment.
Specific embodiment
Below, the image processing system and image forming method referring to the drawings to implementation method are illustrated.In addition, each In figure, except as otherwise noted, otherwise mark identical symbol will be constituted to same.
(first embodiment)
Image processing system and image forming method to first embodiment are illustrated.
Fig. 1 is the schematic cross-section for being monolithically fabricated example of the image processing system for showing first embodiment.Fig. 2 is to show The schematic cross-section of the configuration example of the transfer-fixing device of the image processing system of first embodiment.Fig. 3 is to show the first implementation The block diagram of the function configuration example of the image processing system of mode.
As shown in figure 1, the image processing system 100 of first embodiment includes：Control panel 1, scanner portion 2, printing Machine portion 3, thin slice supply unit 20, delivery section 5 and control unit 6.
Control panel 1 is operated by operator and acts image processing system 100.
The image information for duplicating object is read in scanner portion 2 as the light and shade of light.The figure that scanner portion 2 will read As information output to printer portion 3.
Printer portion 3 is based on the image information for reading in scanner portion 2 or from outside picture signal, by including tone Agent etc. forms output image (hereinafter referred to as toner image) in interior developer.
Be transferred to toner image on the front of thin slice S by printer portion 3.Printer portion 3 is to the color on the front of thin slice S Toner image applies heat with pressure so as to toner image is fixed on thin slice S.
Printer portion 3 is printed on one side or printed on both sides to thin slice S.When being printed on one side, in the surface of thin slice S One side in first face P1 and the second face P2 forms image.When printed on both sides, the first face P1 in the surface of thin slice S and Image is formed on two face P2 simultaneously.
Thin slice supply unit 20 coordinates printer portion 3 to form the timing of toner image, by thin slice S seriatim to printer portion 3 supplies.Thin slice supply unit 20 has paper feeding cassette 20A.Paper feeding cassette 20A accommodates thin slice S.In paper feeding cassette 20A, by the of thin slice S Simultaneously P1 is loaded as following.
Paper feeding cassette 20A has paper feed roller 20a.Paper feed roller 20a seriatim takes out thin slice S from paper feeding cassette 20A.It is removed Thin slice S move to delivery section 5.Because Fig. 1 is schematic diagram, therefore diagram to paper feed roller 20a is simplified.For example, for Paper bowl 20a can be including the multiple roller such as pick-up roller, separate roller.
Thin slice supply unit 20 in addition to paper feeding cassette 20A, can also have supply other species, the thin slice S of size its Its paper feeding cassette.Other paper feeding cassettes have paper feed roller 20a identically with paper feeding cassette 20A.
And, thin slice supply unit 20 can also include manual pallet and manual paper-feeding mechanism.
Delivery section 5 includes conveying guide portion 21, conveying roller 22 and contraposition roller 23.Conveying guide portion 21 will be by thin slice supply unit It is upward that the transport path of the thin slice S of 20 supplies is changed to vertical.Conveying roller 22 is configured at the top of conveying guide portion 21.Conveying roller 22 will convey towards the thin slice S above vertical from conveying guide portion 21 along vertical guide.
Contraposition roller 23 is configured at the vertical top of conveying roller 22.Contraposition roller 23 is adjusted to the front position of thin slice S.It is right Position roller 23 is conveyed to the thin slice S after adjustment position.The conveying timing of roller 23 is aligned according to printer portion 3 by toner image It is secondarily transferred to the timing of thin slice S and determines.
Conveying roller 22 makes the front end on the conveying direction of thin slice S run into the clamping part N of contraposition roller 23.Conveying roller 22 is by making Thin slice S bends to adjust the position of the front end of thin slice S in the conveying direction.
Front end of the contraposition roller 23 to thin slice S at clamping part N is adjusted.And, the contraposition vertical of roller 23 is up conveyed Thin slice S.Aftermentioned transfer-fixing device 24 is located at the top of contraposition roller 23.
Next, being illustrated to the detailed composition in printer portion 3.
Printer portion 3 includes：Image forming part 4A (the first image forming part), intermediate transfer belt 16A (the first intermediate transfers Band) and transfer belt cleaning unit 18A.Printer portion 3 also includes：Image forming part 4B (the second image forming part), intermediate transfer Band 16B (the second intermediate transfer belt) and transfer belt cleaning unit 18B.And, printer portion 3 has transfer-fixing device 24.
Image forming part 4A forms toner image Tma (the first toner figures using toner tm (the first toner) Picture).Toner tm is negatively charged.The color of toner tm is not particularly limited.In the first embodiment, as the one of toner tm Individual example, it is black.
Image forming part 4A has photosensitive drums 10A.There is photosensitive layer on the surface of the metal drum of photosensitive drums 10A.Metal drum Current potential it is identical with the reference potential of image processing system 100.Below, describe current potential it is positive and negative when, it is except as otherwise noted, no Refer to then the positive and negative of reference potential relative to image processing system 100.
The surface of photosensitive drums 10A is negatively charged by aftermentioned charged device 11A.If light irradiation photosensitive layer, exposure position Charged particles are by except electricity.
In image forming part 4A, be configured with around photosensitive drums 10A charged device 11A, exposure portion 19A, developer 12A, Primary transfer roller 13A (first primary transfer roller), cleaning unit 15A and except electrical equipment 14A.Charged device 11A, developer 12A, one Secondary transfer roll 13A, cleaning unit 15A and except electrical equipment 14A by diagram clockwise direction configure successively.
Primary transfer roller 13A is relative with photosensitive drums 10A across the intermediate transfer belt 16A being discussed below.Primary transfer roller Position on the outer peripheral face of the intermediate transfer belt 16A that 13A and photosensitive drums 10A is clamped is first primary transfer position.
Charged device 11A makes the surface of photosensitive drums 10A negatively charged.For example, charged device 11A can be charged using corona discharge Device, pin electrode charged device, charged roller etc..
Surface irradiation exposure light LA from exposure portion 19A to photosensitive drums 10A.Exposure light LA is based on from scanner portion 2 or outside The picture signal of transmission and modulated.The picture signal of exposure portion 19A is sent to from scanner portion 2 or outside and be formed at thin slice Image on the first face P1 of S is corresponding.
Exposure portion 19A forms electrostatic latent image according to picture signal on photosensitive drums 10A.The irradiation position of exposure light LA is band The centre of the allocation position of the allocation position of electrical equipment 11A and aftermentioned developer 12A.For the allocation position of exposure portion 19A, as long as Exposure light LA can be irradiated to above-mentioned irradiation position, do not limited especially.
For example, exposure portion 19A can be using the composition for carrying out laser beam flying.For example, can also be adopted as exposure portion 19A With the composition carried out using the solid state scanning of LED light-emitting component.
Developer 12A makes toner tm negatively charged.If developer 12A is applied in developing bias, by toner tm Make the latent electrostatic image developing on photosensitive drums 10A.The toner tm being attached on photosensitive drums 10A forms tone according to electrostatic latent image Agent image Tma.
Developer 12A can be using known dual component development device or single component development device.
The toner image Tma that primary transfer roller 13A will attach on photosensitive drums 10A is transferred to aftermentioned intermediate transfer Band 16A.Primary transfer roller 13A is applied in positive transfer voltage according to the timing of primary transfer.If to primary transfer roller 13A Apply positive transfer voltage, then toner image Tma is transferred to intermediate transfer belt 16A from photosensitive drums 10A.
Cleaning unit 15A removes the residual toner on photosensitive drums 10A surfaces.Cleaning unit 15A reclaims removed residual Toner.
Except electrical equipment 14A is to the surface irradiation light of photosensitive drums 10A.Except electrical equipment 14A is de-energized to the surface of photosensitive drums 10A.
Intermediate transfer belt 16A is made up of endless belt.Intermediate transfer belt 16A is configured at the top of photosensitive drums 10A.Intermediate transfer Synchronously rotated along the direction opposite with the direction of rotation of photosensitive drums 10A with photosensitive drums 10A with 16A.
Intermediate transfer belt 16A is formed by the material with insulating properties.Intermediate transfer belt 16A is relative to aftermentioned transfer-fixing device Fixing temperature in 24 also has heat resistance.Thin slice S is clipped in the middle between transfer belt 16A and aftermentioned intermediate transfer belt 16B, with Toner tm is set to be fixed on thin slice S.Intermediate transfer belt 16A is pressed to intermediate transfer belt 16B.Now, in intermediate transfer belt Being formed on 16A has the clamping part of width needed for fixing toner tm.
Primary transfer roller 13A is connected to the inner peripheral surface of intermediate transfer belt 16A.Intermediate transfer belt 16A is at least in primary transfer When from surface from primary transfer roller 13A to photosensitive drums 10A press.
And, driven roller 16a and transfer-fixing roller 17A in the way of primary transfer roller 13A is clipped in the middle and with centre The inner peripheral surface of transfer belt 16A is abutted.
Driven roller 16a is configured at the upstream side of the direction of rotation of intermediate transfer belt 16A relative to primary transfer roller 13A.Drive Dynamic roller 16a rotation driving intermediate transfer belts 16A.
Transfer-fixing roller 17A is configured at the downstream of the direction of rotation of intermediate transfer belt 16A relative to primary transfer roller 13A Side.
Driven roller 16a and transfer-fixing roller 17A is driven by intermediate transfer belt drive division 202A (referring to Fig. 3).
Intermediate transfer belt drive division 202A has drive motor (not shown) and drives transfer part.Intermediate transfer belt drives Portion 202A makes driven roller 16a consistent with the direction of rotation of transfer-fixing roller 17A and linear velocity.
Transfer-fixing roller 17A is configured at the first face P1 sides of the thin slice S conveyed by contraposition roller 23.Transfer-fixing roller 17A It is relative with the first face P1 of thin slice S across intermediate transfer belt 16A.
Transfer-fixing roller 17A constitutes a part for aftermentioned transfer-fixing device 24.The detailed composition of transfer-fixing roller 17A will be Describe below.
Driven roller 16a and transfer-fixing roller 17A launch intermediate transfer belt 16A.Jockey pulley 16b is connected to driven roller 16a And the inner peripheral surface of the intermediate transfer belt 16A between transfer-fixing roller 17A.The inner peripheral surface that jockey pulley 16b is abutted is located at primary transfer The opposite side (upside of diagram) of the inner peripheral surface that roller 13A is abutted.
Jockey pulley 16b presses the inner peripheral surface of intermediate transfer belt 16A laterally.Jockey pulley 16b makes opening for intermediate transfer belt 16A Power remains certain.
Transfer belt cleaning unit 18A is configured at the peripheral part of intermediate transfer belt 16A.Transfer belt cleaning unit 18A is in Between transfer belt 16A it is relative with driven roller 16a.
Transfer belt cleaning unit 18A removes the residual toner of intermediate transfer belt 16A outer peripheral faces.Transfer belt cleaning unit 18A reclaims removed residual toner.
Image forming part 4B forms toner image Tpa (the second toner figures using toner tp (the second toner) Picture).Toner tp positively chargeds.The color of toner tp is not particularly limited.In the first embodiment, toner tp and toner Tm colors are identical.
Image forming part 4B has photosensitive drums 10B.The surface of the metal drum of photosensitive drums 10B has photosensitive layer.Metal drum Current potential is identical with the reference potential of image processing system 100.
The surface of photosensitive drums 10B passes through aftermentioned charged device 11B positively chargeds.If light irradiation photosensitive layer, exposure position Charged particles are by except electricity.
In image forming part 4B, be configured with around photosensitive drums 10B charged device 11B, exposure portion 19B, developer 12B, Primary transfer roller 13B (second primary transfer roller), cleaning unit 15B and except electrical equipment 14B.Charged device 11B, developer 12B, one Secondary transfer roll 13B, cleaning unit 15B and except electrical equipment 14B by diagram counter clockwise direction configure successively.
Primary transfer roller 13B is relative with photosensitive drums 10B across aftermentioned intermediate transfer belt 16B.Primary transfer roller 13B with it is photosensitive Position on the outer peripheral face of the intermediate transfer belt 16B that drum 10B is clamped is second primary transfer position.
Charged device 11B makes the surface positively charged of photosensitive drums 10B.For example, charged device 11B can be charged using corona discharge Device, pin electrode charged device, charged roller etc..
Surface irradiation exposure light LB from exposure portion 19B to photosensitive drums 10B.Exposure light LB is based on from scanner portion 2 or outside The picture signal of transmission and modulated.The picture signal of exposure portion 19B is sent to from scanner portion 2 or outside and be formed at thin slice Image on the second face P2 of S is corresponding.
Exposure portion 19B forms electrostatic latent image according to picture signal on photosensitive drums 10B.The irradiation position of exposure light LB is band The centre of the allocation position of the allocation position of electrical equipment 11B and aftermentioned developer 12B.For the allocation position of exposure portion 19B, as long as Exposure light LB can be irradiated to above-mentioned irradiation position, and be not particularly limited.
As exposure portion 19B, in addition to part is configured, can use and be constituted with exposure portion 19A identicals.
Developer 12B makes toner tp positively chargeds.If developer 12B is applied in developing bias, by toner tp Make the latent electrostatic image developing on photosensitive drums 10B.The toner tp being attached on photosensitive drums 10B forms tone according to electrostatic latent image Agent image Tpa.
Developer 12B can be using known dual component development device or single component development device.
The toner image Tpa that primary transfer roller 13B will attach on photosensitive drums 10B is transferred to aftermentioned intermediate transfer Band 16B.Primary transfer roller 13B is applied in negative transfer voltage according to the timing of primary transfer.If to primary transfer roller 13B Apply negative transfer voltage, then toner image Tpa is transferred to intermediate transfer belt 16B from photosensitive drums 10B.
Cleaning unit 15B removes the residual toner on photosensitive drums 10B surfaces.Cleaning unit 15B reclaims removed residual Toner.
Except electrical equipment 14B is to the surface irradiation light of photosensitive drums 10B.Except electrical equipment 14B is de-energized to the surface of photosensitive drums 10B.
Intermediate transfer belt 16B is made up of endless belt.Intermediate transfer belt 16B is configured at the top of photosensitive drums 10B.Intermediate transfer Synchronously rotated along the direction opposite with the direction of rotation of photosensitive drums 10B with photosensitive drums 10B with 16B.
Intermediate transfer belt 16B is formed by the material with insulating properties.Intermediate transfer belt 16B is relative to aftermentioned transfer-fixing device Fixing temperature in 24 also has heat resistance.Intermediate transfer belt 16B has elasticity.Thin slice S is clipped in the middle transfer belt 16B with Between between transfer belt 16A so that toner tp is fixed on thin slice S.Intermediate transfer belt 16B is pressed to intermediate transfer belt 16A. Now, being formed on intermediate transfer belt 16B has the clamping part of width needed for fixing toner tp.
Primary transfer roller 13B is connected to the inner peripheral surface of intermediate transfer belt 16B.Intermediate transfer belt 16B is at least in primary transfer When from surface from primary transfer roller 13B to photosensitive drums 10B press.
And, driven roller 16c and transfer-fixing roller 17B in the way of primary transfer roller 13B is clipped in the middle and with centre The inner peripheral surface of transfer belt 16B is abutted.
Driven roller 16c is configured at the upstream side of the direction of rotation of intermediate transfer belt 16B relative to primary transfer roller 13B.Drive Dynamic roller 16c rotation driving intermediate transfer belts 16B.
Transfer-fixing roller 17B is configured at the downstream of the direction of rotation of intermediate transfer belt 16B relative to primary transfer roller 13B Side.
Driven roller 16c and transfer-fixing roller 17B is driven by intermediate transfer belt drive division 202B (referring to Fig. 3).
Intermediate transfer belt drive division 202B has drive motor (not shown) and drives transfer part.Intermediate transfer belt drives Portion 202B makes driven roller 16c consistent with the direction of rotation of transfer-fixing roller 17B and linear velocity.
Transfer-fixing roller 17B is configured at the second face P2 sides of the thin slice S conveyed by contraposition roller 23.Transfer-fixing roller 17B It is relative with the second face P2 of thin slice S across intermediate transfer belt 16B.
Also, transfer-fixing roller 17B is also relative with transfer-fixing roller 17A across intermediate transfer belt 16B, 16A.Transfer-fixing Roller 17B, 17A are relative to each other in the horizontal direction orthogonal with the conveying direction of thin slice S.
Transfer-fixing roller 17B constitutes a part for aftermentioned transfer-fixing device 24 together with transfer-fixing roller 17A.Transfer-fixing The detailed composition of roller 17B will be described later.
Driven roller 16c and transfer-fixing roller 17B launch intermediate transfer belt 16B.Jockey pulley 16d is connected to driven roller 16c And the inner peripheral surface of the intermediate transfer belt 16B between transfer-fixing roller 17B.The inner peripheral surface that jockey pulley 16d is abutted is located at primary transfer The opposite side (upside of diagram) of the inner peripheral surface that roller 13B is abutted.
Jockey pulley 16d presses the inner peripheral surface of intermediate transfer belt 16B laterally.Jockey pulley 16d makes opening for intermediate transfer belt 16B Power remains certain.
Transfer belt cleaning unit 18B is configured at the peripheral part of intermediate transfer belt 16B.Transfer belt cleaning unit 18B is in Between transfer belt 16B it is relative with driven roller 16c.
Transfer belt cleaning unit 18B removes the residual toner of intermediate transfer belt 16B outer peripheral faces.Transfer belt cleaning unit 18B reclaims removed residual toner.
Toner image Tmb on intermediate transfer belt 16A is secondarily transferred to transfer-fixing device 24 the first face P1 of thin slice S On.Be fixed the toner image Tmb of secondary transfer printing on the first face P1 of thin slice S by transfer-fixing device 24.And, transfer-fixing Be secondarily transferred to toner image Tpb on intermediate transfer belt 16B on the second face P2 of thin slice S by device 24.Transfer-fixing device 24 The toner image Tpb of secondary transfer printing is fixed on the second face P2 of thin slice S.
In transfer-fixing device 24, secondary transfer printing relative to toner image Tmb and it is fixing with relative to toner figure As Tpb secondary transfer printing and fixing carry out simultaneously in parallel.
As shown in Fig. 2 transfer-fixing device 24 includes transfer-fixing roller 17A, 17B and by transfer-fixing roller 17A, 17B Between position intermediate transfer belt 16A, 16B.By the intermediate transfer belt 16A at the position between transfer-fixing roller 17A, 17B, 16B is pressurizeed from transfer-fixing roller 17A, 17B to relative direction.Thus, intermediate transfer belt 16A, 16B deforms.Turn in centre Print band forms clamping part N f between 16A, 16B.
Clamping part N f extends along the length direction of transfer-fixing roller 17A, 17B.
At clamping part N f, the surface of intermediate transfer belt 16A is toner image Tmb is secondarily transferred to thin slice S The simultaneously secondary transfer position of the first of P1.And, at clamping part N f, the surface of intermediate transfer belt 16B is by toner figure The secondary transfer position of the second of the second face P2 of thin slice S is secondarily transferred to as Tpb.
Primary transfer of the path length with second between first primary transfer position and first secondary transfer position Path length between position and second secondary transfer position can be with different.However, in image processing system 100, The primary transfer position of path length between first primary transfer position and first secondary transfer position with second and the Path length between two secondary transfer position is equal to each other.
And, clamping part N f is also that toner image Tmb is fixed into the first face P1 of thin slice S and by toner image Tpb is fixed to the region of the second face P2 of thin slice S.
The width of the clamping part N f on the conveying direction F of thin slice S is set to can simultaneously to carry out fixing toner image The width of heating and the pressurization of Tmb, Tpb.
The conveying guide portion 24a of guiding thin slice S conveyings is configured with below clamping part N f.Conveying guide portion 24a will be thin Piece S is directed to the vertical guide by clamping part N f.
Stay-warm case (not shown) can also be configured around transfer-fixing roller 17A, 17B and intermediate transfer belt 16A, 16B. In the case of being configured with stay-warm case, the cover is configured on the position of without prejudice to thin slice S conveyings.
Transfer-fixing roller 17A has metallic roll 17Aa and heater 17Ab.
Metallic roll 17Aa is formed as hollow circular tube shaped.Metallic roll 17Aa is by intermediate transfer belt drive division 202A (not shown) Rotated by the counter clockwise direction of diagram.The rotation of metallic roll 17Aa is synchronous with the rotation of driven roller 16a.
Both ends on the length direction of metallic roll 17Aa are configured with pressing spring (not shown).Pressing spring is towards metal Roller 17Ba and metallic roll 17Aa is pressurizeed.
Metallic roll 17Aa is applied in negative transfer voltage.If applying negative transfer voltage, by toner image Tmb bis- It is secondary to be transferred to thin slice S.The voltage applied to metallic roll 17Aa is controlled by aftermentioned control unit 6.
Control unit 6 carries out the secondary transfer printing of toner image Tmb by applying negative transfer voltage to metallic roll 17Aa.
The material of metallic roll 17Aa is made up of the good metal of electric conductivity.The pyroconductivity person high of metallic roll 17Aa is excellent. For example, the material of metallic roll 17Aa can include aluminium alloy, iron or copper alloy.
Metallic roll 17Aa is connected to as the intermediate transfer belt 16A of insulator.Metallic roll 17Aa without implementing on the surface Insulating coating.
However, it is also possible to implement various coatings on the surface of metallic roll 17Aa.For example, it is also possible to implement to change and centre The coating of the frictional behavior of transfer belt 16A.For example, it is also possible to implement protective coating, to reduce the mill that intermediate transfer belt 16A causes Damage.
Heater 17Ab is heated to metallic roll 17Aa.The caloric value of heater 17Ab is controlled by aftermentioned control unit. When carrying out fixing action, control unit 6 at least makes the temperature of clamping part N f as the temperature needed for fixing toner image Tmb.
For example, as the configuration example of heater 17Ab, halogen heating lamp, sensing heating (IH) device etc. can be enumerated.
Transfer-fixing roller 17B has metallic roll 17Ba and heater 17Bb.
Metallic roll 17Ba and heater 17Bb have and the metallic roll 17Aa and heater in transfer-fixing roller 17A respectively 17Ab identicals are constituted.
However, metallic roll 17Ba by intermediate transfer belt drive division 202B (not shown) by diagram being rotated clockwise. The rotation of metallic roll 17Ba is synchronous with the rotation of driven roller 16c.
And, the rotary speed of metallic roll 17Ba is identical with the rotary speed of metallic roll 17Aa.
The both ends of the length direction of metallic roll 17Ba are configured with pressing spring (not shown).Pressing spring is towards metallic roll 17Aa and metallic roll 17Ba is pressurizeed.
Metallic roll 17Ba is applied in positive transfer voltage.If applying positive transfer voltage, by toner image Tpb bis- It is secondary to be transferred to thin slice S.The voltage applied to metallic roll 17Ba is controlled by aftermentioned control unit 6.
Control unit 6 carries out the secondary transfer printing of toner image Tpb by applying positive transfer voltage to metallic roll 17Ba.
Heater 17Bb is heated to metallic roll 17Ba.The caloric value of heater 17Bb is controlled by aftermentioned control unit. When carrying out fixing action, control unit 6 at least makes the temperature of clamping part N f as the temperature needed for fixing toner image Tpb.
In image processing system 100, the exposure position of exposure light LA, first primary transfer position and first it is secondary Transfer position image formed path on to be spaced one from predetermined path length in the way of and configure.And, expose light The exposure position of LB, second primary transfer position and second secondary transfer position are formed on path with identical phase in image Position relationship is configured.
Printer portion 3 also includes：ADF guide portion 25, exit roller 26 and discharge tray 27.
The change of ADF guide portion 25 completes the conveying direction of fixing thin slice S.
Complete fixing thin slice S mobile to the vertical top towards ADF guide portion 25 from transfer-fixing device 24.In image In forming apparatus 100, the conveying direction for completing fixing thin slice S is changed to horizontal direction by ADF guide portion 25.
Exit roller 26 will be discharged on discharge tray 27 by the thin slice S of ADF guide portion 25.
Discharge tray 27 places the thin slice S from the discharge of exit roller 26.In embodiments, discharge tray 27 is formed in image The upper horizontal placing sheets S of portion 4A.
As shown in figure 3, control unit 6 is connected with each device part of image processing system 100 in the way of it can communicate.Control Portion processed 6 is controlled to each device part of image processing system 100.
The control that control unit 6 is carried out includes：Control to scanner portion 2, the control to printer portion 3, to thin slice S's Paper supply, conveying, the control of ADF.
Control unit 6 is connected with input unit 200, printer portion 3, delivery section 5 and thin slice supply unit 20 in the way of it can communicate Connect.Control unit 6 is based on being controlled image formation action from the instruction of the input of input unit 200.
Input unit 200 includes：Printer interface 201, above-mentioned control panel 1 and scanner portion 2.
Printer interface 201 is interface when image processing system 100 is used as printer.Printer interface 201 are connected with communication line.Printer interface 201 passes through communication line by the information of the action command of image processing system 100 Control unit 6 is sent to the picture signal that should be printed.
In the picture signal being input into from input unit 200, control unit 6 is based on the figure that should be printed on the P1 of the first faces of thin slice S Exposure portion 19A, the action of image forming part 4A are controlled as signal.
Concurrently, in the picture signal being input into from input unit 200, control unit 6 is based on that the second faces of thin slice S P2 should be printed in On picture signal control exposure portion 19B, the action of image forming part 4B.
Control unit 6 driven by intermediate transfer belt drive division 202A, 202B driven roller 16a, 16c and metallic roll 17Aa, 17Ba。
Control unit 6 controls respective transfer voltage in primary transfer roller 13A, 13B and metallic roll 17Aa, 17Ba and turns Print voltage applies timing.
The caloric value that control unit 6 is based on output change heater 17Ab, 17Bb of temperature sensor (not shown) etc. is gone forward side by side The temperature control of row clamping part N f.
The detailed content of the control carried out on control unit 6, is said together with the action with image processing system 100 It is bright.
The device of control unit 6 is constituted to be included appropriate hardware and is deposited with CPU, memory, input/output interface, outside The computer of storage device etc..Control unit 6 performs control program to realize above-mentioned control function by using computer.Or, control Above-mentioned control function is realized by making appropriate hardware action in portion processed 6.
Image processing system 100 with above-mentioned composition is the device of the image forming method for performing first embodiment. Below, centered on the related action of the image forming method of first embodiment, the action to image processing system 100 is carried out Explanation.
Fig. 4 is that the section illustrated to the action of the transfer-fixing device of the image processing system of first embodiment is illustrated Figure.
In image processing system 100, the instruction that image is formed is performed to the input of control unit 6 from control panel 1 or outside.
The instruction that control unit 6 is based on coming from input unit 200 judges that execution is printed on one side or printed on both sides.
Below, the action first to printed on both sides is illustrated.Hereafter the action being printed on one side illustrates at it.
In printed on both sides, image processing system 100 is on the first face P1 and the second face P2 in thin slice S surfaces while shape Into image.In image processing system 100, the front end of the image formed by image forming part 4A, 4B is same by primary transfer When reach clamping part N f.
If the instruction that image is formed since input unit 200 is received of control unit 6, by thin slice supply unit 20, defeated Send portion 5 to supply and convey thin slice S.Thin slice S reaches contraposition roller 23, and the front end of thin slice S is adjusted in clamping part N.
After clamping part N is adjusted, control unit 6 makes image forming part 4A, 4B start image to be formed for the front end of thin slice S.Figure As the image forming course in forming portion 4A, 4B has difference only on toner tm, the charged characteristic of toner tp.
Action below the control execution of control unit 6.
Photosensitive drums 10A (10B) is rotated by the clockwise direction (counter clockwise direction) of diagram.Charged device 11A (11B) makes photosensitive Negative (just) electricity of the surface band of drum 10A (10B).Exposure light LA (LB) that exposure portion 19A (19B) will be modulated based on picture signal shines It is mapped to the surface of photosensitive drums 10A (10B).The part exposed by exposure light LA (LB) de-energizes according to light exposure.By exposure light The current potential of the part of LA (LB) exposures is changed into post-exposure electrical potential from hot-line electrical potential.Thus, shape on the surface of photosensitive drums 10A (10B) Into the electrostatic latent image based on picture signal.
To permit that the moment of the exposure corresponding to graphics front-end is set to moment t0.Light LA (LB) is exposed in moment t0 reach sense It is the front end of image forming range that light rouses the position on 10A (10B).
Developer 12A (12B) makes latent electrostatic image developing by toner tm (tp).Toner tm (tp) is attached to photosensitive The position that post-exposure electrical potential on drum 10A (10B) changes.Pass through toner tm on the surface of photosensitive drums 10A (10B) (tp) toner image Tma (Tpa) is formed.
The front end of the image forming range on photosensitive drums 10A (10B) reaches first after the certain hour since moment t0 (the second) primary transfer position.The moment is set to moment t1 (however, t1 ＞ t0).
On the other hand, driven roller 16a (16c) and transfer-fixing roller 17A (17B) are by intermediate transfer belt drive division 202A (202B) drives.Therefore, intermediate transfer belt 16A (16B) on the direction opposite with photosensitive drums 10A (10B) with same linear velocity And rotate.
Additionally, controlling the caloric value of heater 17Ab (17Bb) by control unit 6.Heater 17Ab (17Bb) is to metallic roll 17Aa (17Ba) is heated.Heater 17Ab (17Bb) is heated and metallic roll 17Aa by metallic roll 17Aa (17Ba) The intermediate transfer belt 16A (16B) that (17Ba) is abutted.The temperature of clamping part N f is predetermined fixing temperature.
Now, intermediate transfer belt 16As of the heater 17Ab mainly to metallic roll 17Aa and clamping part N f regions is heated. Intermediate transfer belt 16Bs of the heater 17Bb mainly to metallic roll 17Ba and clamping part N f regions is heated.
For example, in the case where fuser is made up of heating roller and backer roll, the heat of the heater of heating roller is by folder Hold portion and conduct heat to backer roll.Heating roller is heated to the backer roll without thermal source.In order that the fixing temperature of clamping part Stabilization is, it is necessary to carry out the intensification with heating roller same degree to the temperature of backer roll.The heat energy of heating roller melts except making toner Beyond melting, also consumed because of the maintenance of the gentle backer roll temperature of the liter of backer roll.Because the thermal capacity of backer roll is larger, therefore rise Heat energy spent by temperature and maintenance temperature is also larger.
However, in the image processing system 100 without the backer roll without thermal source, heater 17Ab, 17Bb are not required to Heat backer roll.Therefore, the summation of the power consumption of heater 17Ab, 17Bb can be made up of heating roller and backer roll The power consumption of the heater of fuser is compared to reduction.
If the fore-end of image forming range reaches first (the second) primary transfer position (moment t1), start Apply the transfer voltage of just (negative) to primary transfer roller 13A (13B).Toner image Tma (Tpa) band of photosensitive drums 10A (10B) Negative (just) electricity.Toner image Tma (Tpa) is transferred to intermediate transfer belt 16A (16B) by primary transfer roller 13A (13B) On.Toner image Tma (Tpa) is moved successively on intermediate transfer belt 16A (16B), sequentially forms toner image Tmb (Tpb)。
The photosensitive drums 10A (10B) that toner image Tma (Tpa) transfers terminate removes surface by cleaning unit 15A (15B) Non-transfer toner.The non-transfer toner for removing is reclaimed by cleaning unit 15A (15B).
Photosensitive drums 10A (10B) receives light irradiation from except electrical equipment 14A (14B).Photosensitive drums 10A (10B) removes the residual on surface Electric charge.
Photosensitive drums 10A (10B) is repeatedly used for above-mentioned such image formation action.
On the other hand, toner image Tmb (Tpb) and intermediate transfer belt on intermediate transfer belt 16A (16B) are transferred to 16A (16B) is moved together.
As shown in Fig. 2 front end Iaf, Ibf of image forming range in intermediate transfer belt 16A, 16B with separate relative to The mode of clamping part N f same path lengths and be close to.By front end Iaf, Ibf of image forming range reach clamping part N f when It is set to moment t3 (however, t3 ＞ t2) quarters.
Moment ts between from moment t0 to moment t3, control unit 6 drives contraposition roller 23.To transfer-fixing device 24 Convey the thin slice S after being adjusted at the clamping part N of contraposition roller 23.
Moment ts is that the front end Sf for making thin slice S reaches the defeated of clamping part N f in moment t3 '=t3- Δs t (however, Δ t ＞ 0) Send start time.Even if Δ t is thin slice S there is the time that conveying error also forms required blank in the leading section of thin slice S.
Therefore, in moment t3, the front end Sf of thin slice S is in somewhat nipped state in clamping part N f.
Control unit 6 started to apply negative transfer voltage (just) to metallic roll 17Aa (17Ba) before moment t3 '.If Apply transfer voltage, then produce electric field between metallic roll 17Aa, 17Ba.The direction of electric field is from metallic roll 17Ba to metallic roll The direction of 17Aa.
As shown in figure 4, after moment t3, toner image Tmb, thin slice S and toner image Tpb are clipped in the middle turn successively Print band is between 16A, 16B.
Electronegative toner image Tmb is subject to come from the face of direction first of the electric field between metallic roll 17Aa, 17Ba The external force fA of P1.Thus, toner image Tmb is transferred to the first face P1.
The toner image Tpb of positively charged is subject to come from the face of direction second of the electric field between metallic roll 17Aa, 17Ba The external force fB of P2.Thus, toner image Tpb is transferred to the second face P2.
The region of close clamping part N f of such secondary transfer printing since the size corresponding to transfer voltage.
On the other hand, the heat for applying to toner image Tmb, Tpb increases with close to clamping part N f.Toner Image Tmb, Tpb gradually soften.
At clamping part N f, while toner image Tmb, the Tpb clamped to intermediate transfer belt 16A, 16B are pressurized And it is heated to fixing temperature.Thus, toner image Tmb, Tpb is melted at clamping part N f.By adding at clamping part N f Be fixed on thin slice S for toner image Tmb, Tpb of melting by pressure.
Thin slice S is moved upward together with the rotation of transfer-fixing roller 17A, 17B from clamping part N f.Now, thin slice S's The fixing toner image TAc for being fixed and having toner image Tmb is formed on first face P1.Formed on the second face P2 of thin slice S It is fixed the fixing toner image TBc for having toner image Tpb.
As shown in figure 1, the thin slice S of abjection transfer-fixing device 24 changes conveying direction by ADF guide portion 25.If thin slice S The leading section of ADF guide portion 25 is reached, then discharge tray 27 is discharged to by exit roller 26.It is thin in image processing system 100 Piece S is discharged with the first face P1 towards the state of the bottom surface of discharge tray 27.
Now, in thin slice S fixing toner figure corresponding with picture signal is formed on the first face P1, the second face P2 respectively As TAc, TBc.
More than, terminate the explanation to printed on both sides action.
Next, the action to being printed on one side is illustrated.
It is printed on one side by image processing system 100, as long as stopping being formed without image in image forming part 4A, 4B A side image formation action.Which in image forming part 4A, 4B carries out that image formed can be by input unit 200 Selected.Or, it is also possible to the use of which in image forming part 4A, 4B is fixed.
In image processing system 100, as an example, in the case where being printed on one side using only image forming part 4A。
Below, centered on different from printed on both sides part, being printed on one side for image processing system 100 is illustrated.
When being printed on one side, control unit 6 makes to include the action whole for being rotated in interior image forming part 4B of photosensitive drums 10B Stop.Intermediate transfer belt drive division 202B and intermediate transfer belt drive division 202A synchronously carries out dynamic with printed on both sides identical Make.However, releasing pressings of the primary transfer roller 13B to photosensitive drums 10B.Therefore, intermediate transfer belt 16B is relative to photosensitive drums 10B It is non-contacting.
Control unit 6 does not apply transfer voltage to primary transfer roller 13B.
Apply to metallic roll 17Ba with printed on both sides identical the action of transfer voltage.
Compared with when printed on both sides, the caloric value of the reduction heater of control unit 6 17Bb.
When being printed on one side, it is not necessary to melt the toner image on the second face P2.And, heater 17Bb is only to tight The intermediate transfer belt 16B of the excellent metallic roll 17Ba of patch heat conductivity is heated.Therefore, with from clamping part to thermal capacity Larger backer roll is compared in the case of being heated, and the temperature of intermediate transfer belt 16B rises comparatively fast.Therefore, add even if reducing The caloric value of hot device 17Bb, it is also possible to make the temperature of clamping part N f be maintained at appropriate fixing temperature.
As described above, image processing system 100 makes thin slice S only by primary transfer fuser 24, just can carry out two-sided Printing.Therefore, image processing system 100 can carry out printed on both sides with the identical time that is printed on one side.Formed in image and filled Put in 100, the time that thin slice S is overturn after being printed on one side can be saved.Therefore, the perfecting in image processing system 100 The printing time of brush is in a ratio of less than half with the situation for passing twice through fuser.
And, transfer-fixing roller 17A, 17B of image processing system 100 have heater 17Ab, 17Bb respectively.Therefore, Either it is printed on one side or printed on both sides, can be dropped compared with there is the fuser of combined heated roller and backer roll Low power consumption.Especially compared to the situation of printed on both sides, power consumption is changed into only about half of.
And, in image processing system 100, carry out secondary transfer printing simultaneously on transfer-fixing device 24 and be fixed.Therefore, With secondary transfer printing is carried out compared with fixing situation in diverse location, device can be made to become miniaturization.Further, since transfer is fixed Shadow roller 17A, 17B are also used as secondary transfer roller and fixing roller, therefore, it is possible to reduce components number.
In image processing system 100, apply the transfer voltage of opposite polarity to metallic roll 17Aa, 17Ba respectively.Pass through The making a concerted effort of the repulsive force that comes from metallic roll 17Aa and the attraction that comes from metallic roll 17Ba carry out transfer toner image Tmb. By making a concerted effort come transfer toner image for the repulsive force for coming from metallic roll 17Ba and the attraction for coming from metallic roll 17Aa Tpb。
Thus, efficiently secondary transfer printing toner image Tmb, Tpb, and it is uneven to suppress transfer.
According to image processing system 100, because the action for making image forming part 4B when being printed on one side stops, therefore, with Being compared during printed on both sides can reduce power consumption.
(second embodiment)
Image processing system to second embodiment is illustrated.
Fig. 5 is the schematic cross-section for being monolithically fabricated example of the image processing system for showing second embodiment.
As shown in figure 5, there is the image processing system 101 of second embodiment transfer-fixing device 44 to replace above-mentioned first The transfer-fixing device 24 of the image processing system 100 of implementation method.
Transfer-fixing device 44 have secondary transfer roller 37A, 37B replace transfer-fixing device 24 in transfer-fixing roller 17A, 17B.Transfer-fixing device 44 also has entrance directing plate 38 and fixing roller 39A, 39B.
Below, illustrated centered on different from above-mentioned first embodiment part.
Toner image Tmb (Tpb) is secondarily transferred to secondary transfer roller 37A (37B) the first face P1 (second of thin slice S Face P2).If secondary transfer printing toner image Tmb (Tpb), toner image is formed on the first face P1 (the second face P2) Tmc(Tpc)。
According to the timing of secondary transfer printing, negative transfer voltage (just) is applied to secondary transfer roller 37A (37B).
Secondary transfer roller 37A's (37B) is configured to using transfer-fixing roller 17A, the 17B in above-mentioned first embodiment In remove the composition of heater 17Ab, 17Bb.However, the composition of secondary transfer roller 37A (37B) is not limited to this.For example, also can Enough all using the composition of known secondary transfer roller when applying secondary transfer printing voltage from the inner side of intermediate transfer belt.
Configure secondary transfer roller 37A, 37B relatively identically with transfer-fixing roller 17A, 17B.With transfer-fixing roller 17A, 17B in the same manner in an opposite direction each other pressurize secondary transfer roller 37A, 37B.Thus, it is sandwiched in secondary transfer roller 37A, 37B Intermediate transfer belt 16A, 16B between form clamping part N t.
Clamping part N t has can be secondarily transferred on thin slice S toner image Tmb, Tpb and thin slice S verticals is upward The width of driving.Therefore, the mutual plus-pressure of secondary transfer roller 37A, 37B can be less than transfer-fixing roller 17A, 17B Mutual plus-pressure.
The position of the intermediate transfer belt 16A at clamping part N t is first secondary transfer position.Centre at clamping part N t The position of transfer belt 16B is second secondary transfer position.
Entrance directing plate 38 is by the front end guidance of the thin slice S that vertical is delivered up by clamping part N t to aftermentioned fixing roller At the clamping part N F of 39A, 39B.
Fixing roller 39A (39B) is fixed toner image Tmc (Tpc) on the first face P1 (the second face P2) of thin slice S.By This, fixing roller 39A (39B) is heated and pressurizeed to toner image Tmc (Tpc).
Metallic roll and the heating in metallic roll inner heat that fixing roller 39A, 39B are covered with surface by rubber layer respectively Device.Fixing roller 39A, 39B are pressed and are formed clamping part N F each other.Fixing roller 39A, 39B are by drive division (not shown) with each other Rightabout rotates.Can be delivered up for the thin slice S verticals that clamping part N F is clamped by fixing roller 39A, 39B.
The rubber hardness on fixing roller 39A, 39B surfaces can be made identical.Now, due to the first face P1 of thin slice S and second Face P2 is pressurizeed by equalization respectively, therefore clamping part N F becomes relatively flat.Thereby, it is possible to suppress to be fixed it during printed on both sides Curling afterwards.
The thin slice S that fixing roller 39A, 39B are conveyed is transported to the inside of ADF guide portion 25.
The heater of fixing roller 39A, 39B is protected with by clamping part N F identically with the heater of transfer-fixing roller 17A, 17B Hold and heated in the mode of fixing temperature.
Conveying of secondary transfer roller 37A, 37B and fixing roller 39A, 39B of transfer-fixing device 44 as described above in thin slice S It is adjacent to configuration on path.
Secondary transfer roller 37A, 37B clamps the first face P1 of thin slice S, the second face P2 across intermediate transfer belt 16A, 16B. When printed on both sides is carried out, secondary transfer roller 37A, 37B simultaneously secondary transfer printing toner image Tmb, Tpb.
Fixing roller 39A, 39B are same by toner image Tmc, the Tpc after secondary transfer printing in the case where printed on both sides is carried out When be fixed in thin slice S.
In this way, transfer-fixing device 44 be first, second secondary transfer position and secondary transfer printing after toner image It is fixed the example in the case that position is separately present in transfer-fixing device.
Thus, image processing system 101 and image processing system 100 the difference is that only secondary transfer printing action and fixed Shadow is acted.
In the transfer-fixing device 44 of image processing system 101, enter successively since the part of secondary transfer printing release The fixing action of row.It is poor that secondary transfer printing acts the existence time and fixing action between.
However, carried out to the first face P1 and the second face P2 on secondary transfer roller 37A, 37B as to be mutually facing simultaneously Secondary transfer printing is acted.Be as to be mutually facing in fixing roller 39A, 39B while being fixed to the first face P1 and the second face P2 Action.
Acted by such secondary transfer printing and fixing action, thin slice S is only once led in image processing system 101 Crossing transfer-fixing device 44 just can carry out printed on both sides.Therefore, it is possible to carry out printed on both sides with the identical time that is printed on one side. In image processing system 101, the time that thin slice S is overturn after being printed on one side can be saved.Therefore, the printing time of printed on both sides Less than half is in a ratio of with the situation for passing twice through fuser.
Additionally, in image processing system 101, being applied to secondary transfer roller 37A, 37B respectively on the second transfer action Plus opposite transfer voltage is on this point, with first embodiment identical act on.I.e., by from secondary transfer roller The making a concerted effort of the repulsive force of 37A and the attraction from secondary transfer roller 37B carry out transfer toner image Tmb.By from secondary The making a concerted effort of the repulsive force of transfer roll 37B and the attraction from secondary transfer roller 37A carry out transfer toner image Tpb.
Thus, efficiently secondary transfer printing toner image Tmb, Tpb, and it is uneven to suppress transfer.
And, secondary transfer roller 37A, 37B is across thin slice S and the symmetrical composition in face.Therefore, acted in secondary transfer printing In, face is symmetrical with thin slice S as the plane of symmetry for plus-pressure that thin slice S is produced between secondary transfer roller 37A, 37B and electric field.Cause This, thin slice S is difficult to the entanglement that conveying direction occurs after secondary transfer printing.Therefore, suppress thin slice S-phase for fixing roller 39A, The clamping part N F of 39B is produced in the state of rocking, and is easily accessible the approximately mid way between of entrance directing plate 38.Thereby, it is possible to press down Make the friction of non-transfer toner.
And, image processing system 101 carries out being acted with the identical of image processing system 100 when being printed on one side.Image Forming apparatus 101 identically with image processing system 100 stops the action of image forming part 4B when being printed on one side.Therefore, Power consumption can be reduced compared with when printed on both sides.
Below, the variation to above-mentioned implementation method is illustrated.
In the respective embodiments described above, carried out in case of image forming part 4A, 4B form monochrome image respectively Explanation.But, for example, can also be dividually to configure multiple images forming portion 4A and primary transfer roller along intermediate transfer belt 16A The composition of 13A.In this case, if changing the color of each toner, the toner image of multiple color can be formed. If for example, forming yellow, magenta, cyan, four kinds of toner images of color of black, the toner of full color can be formed Image.
If equally also configuration multiple images forming portion 4B and primary transfer roller 13B, two-sided on intermediate transfer belt 16B Printing can also be carried out with multiple color or full color.
In the respective embodiments described above, closed with the relative position of exposure position, primary transfer position and secondary transfer position It is illustrated in case of system is identical respectively.But, if the front end of the image forming range of each one side reaches simultaneously First and second secondary transfer position, then each exposure position on path, each primary transfer position can also be different.
According at least one implementation method discussed above, image processing system has the first image forming part, second Image forming part, the first intermediate transfer belt and the second intermediate transfer belt.First image forming part forms electronegative first tone Agent image.Second image forming part forms the second toner image of positively charged.First intermediate transfer belt and the second intermediate transfer Band is relative to each other on first secondary transfer position and second secondary transfer position.And, image processing system has Toner image is transferred and is fixed on the first face of thin slice and the second face in first transfer position and the second transfer position Transfer-fixing device.Therefore, image processing system can make the thin slice only once just can carry out printed on both sides by transfer-fixing device. Image processing system can reduce printing time.Image processing system can reduce fixing power consumption.
Although the description of several implementation methods, but these implementation methods are intended only as example and propose, it is not intended that limit The scope of invention.These implementation methods can be implemented in other various modes, can be in the model of the objective for not departing from invention Various omissions, replacement, change are carried out in enclosing.These implementation methods and its deformation are included in the scope and spirit of invention, together In the invention being included in described in claims and its scope of equalization sample.

Claims (10)

1. a kind of image processing system, including：
First image forming part, the first toner image is formed using electronegative first toner；
Second image forming part, the second toner image is formed using the second toner of positively charged；
First intermediate transfer belt, is formed by endless belt, from the first toner figure described in described first image forming portion primary transfer Picture, and by primary transfer after first toner image move to first secondary transfer position；
Second intermediate transfer belt, is formed by the endless belt relative with first intermediate transfer belt, is formed from second image Second toner image described in portion's primary transfer, and by primary transfer after second toner image move to and described One secondary transfer position it is relative second secondary transfer position；
Delivery section, thin slice is transported between described first secondary transfer position and described second secondary transfer position；With And
Transfer-fixing device, described first secondary transfer position by first toner on the first intermediate transfer band Image is secondarily transferred to the first face of the thin slice, and be transferred to first toner image in first face be fixed in First face, also, described second secondary transfer position by second tone on the second intermediate transfer band Agent image is secondarily transferred to second face with first face opposite side of the thin slice, and is transferred to second face Second toner image is fixed in second face.
2. image processing system according to claim 1, wherein,
The transfer-fixing device includes：
First transfer-fixing roller, the inner side of first intermediate transfer belt being configured on described first secondary transfer position, First toner image is secondarily transferred to first face, and across first intermediate transfer belt to first face Pressurizeed and heated, first toner image is fixed on first face；And
Second transfer-fixing roller, the inner side of second intermediate transfer belt being configured on described second secondary transfer position, Second toner image is secondarily transferred to second face, and across second intermediate transfer belt to second face Pressurizeed and heated, second toner image is fixed on second face.
3. image processing system according to claim 2, wherein,
The first transfer-fixing roller is applied in negative transfer voltage,
The second transfer-fixing roller is applied in positive transfer voltage.
4. image processing system according to claim 2, wherein,
First intermediate transfer belt and second intermediate transfer belt are made up of the soft rubber material with insulating properties,
The first transfer-fixing roller and the second transfer-fixing roller include：
Metallic roll, it is conductive；And
Heater, inserts the inside of the metallic roll.
5. image processing system according to claim 1, wherein,
Described first secondary transfer position and described second secondary transfer position are relative in the horizontal direction, also,
The delivery section is along vertical between described first secondary transfer position and described second secondary transfer position Convey the thin slice.
6. image processing system according to claim 1, wherein,
First primary transfer roller is configured with the inside of first intermediate transfer belt, described first primary transfer roller is applied Plus positive transfer voltage, and first toner image that described first image forming portion is formed is transferred to described the One intermediate transfer belt,
Second primary transfer roller is configured with the inside of second intermediate transfer belt, described second primary transfer roller is applied Plus negative transfer voltage, and second toner image that second image forming part is formed is transferred to described the Two intermediate transfer belts.
7. image processing system according to claim 1, wherein,
Described first image forming portion includes electronegative first photosensitive drums,
Second image forming part includes the second photosensitive drums of positively charged.
8. image processing system according to claim 2, wherein,
Only in the case where first face of the thin slice carries out image formation, described image forming apparatus makes described second turn The temperature for printing fixing roller is less than the first transfer-fixing roller,
Only in the case where second face of the thin slice carries out image formation, described image forming apparatus makes described first turn The temperature for printing fixing roller is less than the second transfer-fixing roller.
9. image processing system according to claim 5, wherein,
Only in the case where the one side of the thin slice carries out image formation, described image forming apparatus will be by described first image shape First toner image formed into portion is transferred and is fixed in first face of the thin slice.
10. a kind of image forming method, including：
The first toner image is formed using electronegative first toner；
The second toner image is formed using the second toner of positively charged；
First toner image is transferred to the first intermediate transfer belt, and by primary transfer after first tone Agent image moves to the secondary transfer position of the first of first intermediate transfer belt；
Second toner image is transferred to the second intermediate transfer belt, and by primary transfer after second tone Agent image moves to the secondary transfer position of the second of second intermediate transfer belt；
Thin slice is transported between described first secondary transfer position and described second secondary transfer position；And
Described first secondary transfer position by secondary turn of first toner image on the first intermediate transfer band The first face of the thin slice is printed to, and is transferred to first toner image in first face and be fixed in described first Face, also, described second secondary transfer position by second toner image two on the second intermediate transfer band It is secondary to be transferred to second face with first face opposite side of the thin slice, and it is transferred to described the second of second face Toner image is fixed in second face.
CN201610811604.3A 2015-11-10 2016-09-08 Image processing system and image forming method Withdrawn CN106873337A (en)

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Application publication date: 20170620